Topic: how to use beer's law to find %P2O5 by mass (Read 2599 times)

plasticfood · « **on:** October 30, 2011, 04:27:43 PM »

i do know the absorbance of solution, and have the molarity of PO₄^3- for 3 separate trials. i really have clue what to do after this.

TheUnfocusedOne · « **Reply #1 on:** November 02, 2011, 03:06:37 PM »

i do know the absorbance of solution, and have the molarity of PO₄^3- for 3 separate trials. i really have clue what to do after this.

This looks like a pretty good worked example of what you're doing. http://chemistry.about.com/od/workedchemistryproblems/a/percentmass.htm

Don't over think things, you already have a concentration.